The Audio2000'S ADC2716B4 reels are 4-pack cable reels/cord reels each with a black steel frame and a black plastic cable drum. The width of each cable drum is 4.7 inches. The diameter of each drum is 10.8 inches. Each cable drum can hold up to 330 feet of cable with the cable diameter of 6mm (about 1/4 inches). Constructed with heavy-duty steel frame and high-quality plastic cable drum, the ADC2716B4 reels are rugged, durable and dependable cable reels. Furthermore, each ADC2716B4 is highly portable.